thermoperiodism

noun
ther·mo·pe·ri·od·ism | \ ˌthər-mō-ˈpir-ē-ə-ˌdi-zəm \

Definition of thermoperiodism 

: the sum of the responses especially of a plant to appropriately fluctuating temperatures

First Known Use of thermoperiodism

circa 1937, in the meaning defined above

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The first known use of thermoperiodism was circa 1937

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occurring twice a year or every two years

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